Application Report
SNLA140B – May 2004 – Revised May 2013
AN-31 Op Amp Circuit Collection
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ABSTRACT
This application report provides basic circuits of the Texas Instruments op amp collection.
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Contents
Introduction .................................................................................................................. 4
Basic Circuits ................................................................................................................ 4
Signal Generation ......................................................................................................... 15
Signal Processing ......................................................................................................... 25
List of Figures
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Inverting Amplifier ........................................................................................................... 4
2
Non-Inverting Amplifier ..................................................................................................... 4
3
Difference Amplifier ......................................................................................................... 4
4
Inverting Summing Amplifier ............................................................................................... 5
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Non-Inverting Summing Amplifier ......................................................................................... 5
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Inverting Amplifier with High Input Impedance .......................................................................... 5
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Fast Inverting Amplifier with High Input Impedance .................................................................... 6
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Non-Inverting AC Amplifier
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................................................................................................ 6
Practical Differentiator ...................................................................................................... 7
Integrator ..................................................................................................................... 7
Fast Integrator ............................................................................................................... 8
Current to Voltage Converter .............................................................................................. 8
Circuit for Operating the LM101 Without a Negative Supply .......................................................... 9
Circuit for Generating the Second Positive Voltage .................................................................... 9
Neutralizing Input Capacitance to Optimize Response Time ......................................................... 9
Integrator with Bias Current Compensation ............................................................................ 10
Voltage Comparator for Driving DTL or TTL Integrated Circuits .................................................... 10
Threshold Detector for Photodiodes .................................................................................... 11
Double-Ended Limit Detector ............................................................................................ 11
Multiple Aperture Window Discriminator................................................................................ 12
Offset Voltage Adjustment for Inverting Amplifiers Using Any Type of Feedback Element ..................... 13
Offset Voltage Adjustment for Non-Inverting Amplifiers Using Any Type of Feedback Element ............... 13
Offset Voltage Adjustment for Voltage Followers ..................................................................... 13
Offset Voltage Adjustment for Differential Amplifiers ................................................................. 14
Offset Voltage Adjustment for Inverting Amplifiers Using 10 kΩ Source Resistance or Less ................... 14
Low Frequency Sine Wave Generator with Quadrature Output ..................................................... 15
High Frequency Sine Wave Generator with Quadrature Output .................................................... 16
Free-Running Multivibrator ............................................................................................... 16
Wein Bridge Sine Wave Oscillator ...................................................................................... 17
Function Generator ........................................................................................................ 17
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31
Pulse Width Modulator .................................................................................................... 18
32
Bilateral Current Source .................................................................................................. 18
33
Bilateral Current Source .................................................................................................. 19
34
Wein Bridge Oscillator with FET Amplitude Stabilization
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Low Power Supply for Integrated Circuit Testing .....................................................................
Positive Voltage Reference ..............................................................................................
Positive Voltage Reference ..............................................................................................
Negative Voltage Reference .............................................................................................
Negative Voltage Reference .............................................................................................
Precision Current Sink ....................................................................................................
Precision Current Source .................................................................................................
Differential-Input Instrumentation Amplifier ............................................................................
Variable Gain, Differential-Input Instrumentation Amplifier ..........................................................
Instrumentation Amplifier with ±100 Volt Common Mode Range ...................................................
Instrumentation Amplifier with ±10 Volt Common Mode Range .....................................................
High Input Impedance Instrumentation Amplifier ......................................................................
Bridge Amplifier with Low Noise Compensation.......................................................................
Bridge Amplifier ............................................................................................................
Precision Diode ............................................................................................................
Precision Clamp ...........................................................................................................
Fast Half Wave Rectifier ..................................................................................................
Precision AC to DC Converter ...........................................................................................
Low Drift Peak Detector ..................................................................................................
Absolute Value Amplifier with Polarity Detector .......................................................................
Sample and Hold ..........................................................................................................
Sample and Hold ..........................................................................................................
Low Drift Integrator ........................................................................................................
Fast† Summing Amplifier with Low Input Current .....................................................................
Fast Integrator with Low Input Current .................................................................................
Adjustable Q Notch Filter .................................................................................................
Easily Tuned Notch Filter .................................................................................................
Tuned Circuit ...............................................................................................................
Two-Stage Tuned Circuit .................................................................................................
Negative Capacitance Multiplier .........................................................................................
Variable Capacitance Multiplier ..........................................................................................
Simulated Inductor ........................................................................................................
Capacitance Multiplier ....................................................................................................
High Pass Active Filter ....................................................................................................
Low Pass Active Filter ....................................................................................................
Nonlinear Operational Amplifier with Temperature Compensated Breakpoints ...................................
Current Monitor ............................................................................................................
Saturating Servo Preamplifier with Rate Feedback ...................................................................
Power Booster .............................................................................................................
Analog Multiplier ...........................................................................................................
Long Interval Timer ........................................................................................................
Fast Zero Crossing Detector .............................................................................................
Amplifier for Piezoelectric Transducer ..................................................................................
Temperature Probe........................................................................................................
Photodiode Amplifier ......................................................................................................
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Photodiode Amplifier ...................................................................................................... 48
81
High Input Impedance AC Follower ..................................................................................... 48
82
Temperature Compensated Logarithmic Converter................................................................... 49
83
Root Extractor .............................................................................................................. 49
84
Multiplier/Divider ........................................................................................................... 50
85
Cube Generator............................................................................................................ 50
86
Fast Log Generator
87
Anti-Log Generator ........................................................................................................ 51
.......................................................................................................
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3
Introduction
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Introduction
Texas Instruments recommends replacing 2N2920 and 2N3728 matched pairs with LM394 in all
application circuits.
2
Basic Circuits
Figure 1. Inverting Amplifier
Figure 2. Non-Inverting Amplifier
For minimum offset error due to input bias current.
Figure 3. Difference Amplifier
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R5 = R1//R2//R3//R4
For minimum offset error due to input bias current/
Figure 4. Inverting Summing Amplifier
* RS = 1k for 1% accuracy
Figure 5. Non-Inverting Summing Amplifier
* Source Impedance less than 100k gives less than 1% gain error.
Figure 6. Inverting Amplifier with High Input Impedance
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Figure 7. Fast Inverting Amplifier with High Input Impedance
Figure 8. Non-Inverting AC Amplifier
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Figure 9. Practical Differentiator
For minimum offset error due to input bias current.
Figure 10. Integrator
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Figure 11. Fast Integrator
VOUT = lIN R1
*For minimum error due to bias current R2 = R1
Figure 12. Current to Voltage Converter
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Figure 13. Circuit for Operating the LM101 Without a Negative Supply
Figure 14. Circuit for Generating the Second Positive Voltage
Figure 15. Neutralizing Input Capacitance to Optimize Response Time
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* Adjust for zero integrator drift.
Current drift typically 0.1 n/A°C over −55°C to 125°C temperature range.
Figure 16. Integrator with Bias Current Compensation
Figure 17. Voltage Comparator for Driving DTL or TTL Integrated Circuits
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Figure 18. Threshold Detector for Photodiodes
VOUT = 4.6V for VLT ≤ VIN ≤ VUT
VOUT = 0V for VIN < VLT or VIN > VUT
Figure 19. Double-Ended Limit Detector
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Figure 20. Multiple Aperture Window Discriminator
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Figure 21. Offset Voltage Adjustment for Inverting Amplifiers Using Any Type of Feedback Element
Figure 22. Offset Voltage Adjustment for Non-Inverting Amplifiers Using Any Type of Feedback Element
Figure 23. Offset Voltage Adjustment for Voltage Followers
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Figure 24. Offset Voltage Adjustment for Differential Amplifiers
Figure 25. Offset Voltage Adjustment for Inverting Amplifiers Using 10 kΩ Source Resistance or Less
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Signal Generation
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Signal Generation
Figure 26. Low Frequency Sine Wave Generator with Quadrature Output
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Figure 27. High Frequency Sine Wave Generator with Quadrature Output
* Chosen for oscillation at 100 Hz
Figure 28. Free-Running Multivibrator
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* Eldema 1869 10V, 14 mA Bulb
Figure 29. Wein Bridge Sine Wave Oscillator
Figure 30. Function Generator
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Figure 31. Pulse Width Modulator
Figure 32. Bilateral Current Source
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Figure 33. Bilateral Current Source
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Figure 34. Wein Bridge Oscillator with FET Amplitude Stabilization
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* VOUT = 1V/kΩ
Figure 35. Low Power Supply for Integrated Circuit Testing
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Figure 36. Positive Voltage Reference
Figure 37. Positive Voltage Reference
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Figure 38. Negative Voltage Reference
Figure 39. Negative Voltage Reference
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Figure 40. Precision Current Sink
Figure 41. Precision Current Source
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Signal Processing
Figure 42. Differential-Input Instrumentation Amplifier
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Signal Processing
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* Gain adjust AV = 10−4 R6
Figure 43. Variable Gain, Differential-Input Instrumentation Amplifier
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† Matching determines common mode rejection.
Figure 44. Instrumentation Amplifier with ±100 Volt Common Mode Range
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Figure 45. Instrumentation Amplifier with ±10 Volt Common Mode Range
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*† Matching Determines CMRR
‡ May be deleted to maximize bandwidth
Figure 46. High Input Impedance Instrumentation Amplifier
* Reduces feed through of power supply noise by 20 dB and makes supply bypassing unnecessary.
† Trim for best common mode rejection
‡ Gain adjust
Figure 47. Bridge Amplifier with Low Noise Compensation
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Figure 48. Bridge Amplifier
Figure 49. Precision Diode
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* EREF must have a source impedance of less than 200Ω if D2 is used.
Figure 50. Precision Clamp
Figure 51. Fast Half Wave Rectifier
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* Feedforward compensation can be used to make a fast full wave rectifier without a filter.
Figure 52. Precision AC to DC Converter
Figure 53. Low Drift Peak Detector
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Figure 54. Absolute Value Amplifier with Polarity Detector
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Signal Processing
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* Polycarbonate-dielectric capacitor
Figure 55. Sample and Hold
* Worst case drift less than 2.5 mV/sec
† Teflon, Polyethylene or Polycarbonate Dielectric Capacitor
Figure 56. Sample and Hold
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* Q1 and Q3 should not have internal gate-protection diodes.
Worst case drift less than 500 μV/sec over −55°C to +125°C.
Figure 57. Low Drift Integrator
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* In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability
and eliminates thermal feedback.
† Power Bandwidth: 250 kHz
Small Signal Bandwidth: 3.5 MHz
Slew Rate: 10V/μs
Figure 58. Fast† Summing Amplifier with Low Input Current
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Figure 59. Fast Integrator with Low Input Current
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Figure 60. Adjustable Q Notch Filter
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Figure 61. Easily Tuned Notch Filter
Figure 62. Tuned Circuit
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Figure 63. Two-Stage Tuned Circuit
Figure 64. Negative Capacitance Multiplier
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Figure 65. Variable Capacitance Multiplier
L ≥ R1 R2 C1
RS = R2
RP = R1
Figure 66. Simulated Inductor
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Figure 67. Capacitance Multiplier
* Values are for 100 Hz cutoff. Use metalized polycarbonate capacitors for good temperature stability.
Figure 68. High Pass Active Filter
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* Values are for 10 kHz cutoff. Use silvered mica capacitors for good temperature stability.
Figure 69. Low Pass Active Filter
Figure 70. Nonlinear Operational Amplifier with Temperature Compensated Breakpoints
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Figure 71. Current Monitor
Figure 72. Saturating Servo Preamplifier with Rate Feedback
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Figure 73. Power Booster
Figure 74. Analog Multiplier
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* Low leakage −0.017 μF per second delay
Figure 75. Long Interval Timer
Propagation delay approximately 200 ns
† DTL or TTL fanout of three.
Minimize stray capacitance
Pin 8
Figure 76. Fast Zero Crossing Detector
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Low frequency cutoff = R1 C1
Figure 77. Amplifier for Piezoelectric Transducer
* Set for 0V at 0°C
† Adjust for 100 mV/°C
Figure 78. Temperature Probe
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VOUT = R1 ID
Figure 79. Photodiode Amplifier
VOUT = 10 V/μA
*Operating photodiode with less than 3 mV across it eliminates leakage currents.
Figure 80. Photodiode Amplifier
Figure 81. High Input Impedance AC Follower
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10 nA < IIN < 1 mA
Sensitivity is 1V per decade
† 1 kΩ (±1%) at 25°C, +3500 ppm/°C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
* Determines current for zero crossing on output: 10 μA as shown.
Figure 82. Temperature Compensated Logarithmic Converter
*† 2N3728 matched pairs
Figure 83. Root Extractor
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Figure 84. Multiplier/Divider
Figure 85. Cube Generator
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† 1 kΩ (±1%) at 25°C, +3500 ppm/°C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
Figure 86. Fast Log Generator
† 1 kΩ (±1%) at 25°C, +3500 ppm/°C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
Figure 87. Anti-Log Generator
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